概述
Less-21
做一个简单测试：
username：admin
password：aaa
这里的界面和上一关的内容差不多，唯一的区别就是cookie使用了base64进行了加密，这里我们贴出该关的代码：
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>Less-21 Cookie Injection- Error Based- complex - string</title>
</head>
<body bgcolor="#000000">
<?php
//including the Mysql connect parameters.
include("../sql-connections/sql-connect.php");
if(!isset($_COOKIE['uname']))
{
//including the Mysql connect parameters.
include("../sql-connections/sql-connect.php");
echo "<div style=' margin-top:20px;color:#FFF; font-size:24px; text-align:center'> Welcome <font color='#FF0000'> Dhakkan </font><br></div>";
echo "<div align='center' style='margin:20px 0px 0px 510px;border:20px; background-color:#0CF; text-align:center;width:400px; height:150px;'>";
echo "<div style='padding-top:10px; font-size:15px;'>";
echo "<!--Form to post the contents -->";
echo '<form action=" " name="form1" method="post">';
echo ' <div style="margin-top:15px; height:30px;">Username : ';
echo ' <input type="text" name="uname" value=""/> </div>';
echo ' <div> Password : ';
echo ' <input type="text" name="passwd" value=""/></div></br>';
echo ' <div style=" margin-top:9px;margin-left:90px;"><input type="submit" name="submit" value="Submit" /></div>';
echo '</form>';
echo '</div>';
echo '</div>';
echo '<div style=" margin-top:10px;color:#FFF; font-size:23px; text-align:center">';
echo '<font size="3" color="#FFFF00">';
echo '<center><br><br><br>';
echo '<img src="../images/Less-21.jpg" />';
echo '</center>';
function check_input($value)
{
if(!empty($value))
{
$value = substr($value,0,20); // truncation (see comments)
}
if (get_magic_quotes_gpc()) // Stripslashes if magic quotes enabled
{
$value = stripslashes($value);
}
if (!ctype_digit($value)) // Quote if not a number
{
$value = "'" . mysql_real_escape_string($value) . "'";
}
else
{
$value = intval($value);
}
return $value;
}
echo "<br>";
echo "<br>";
if(isset($_POST['uname']) && isset($_POST['passwd']))
{
$uname = check_input($_POST['uname']);
$passwd = check_input($_POST['passwd']);
$sql="SELECT users.username, users.password FROM users WHERE users.username=$uname and users.password=$passwd ORDER BY users.id DESC LIMIT 0,1";
$result1 = mysql_query($sql);
$row1 = mysql_fetch_array($result1);
if($row1)
{
echo '<font color= "#FFFF00" font size = 3 >';
setcookie('uname', base64_encode($row1['username']), time()+3600);
echo "I LOVE YOU COOKIES";
echo "</font>";
echo '<font color= "#0000ff" font size = 3 >';
//echo 'Your Cookie is: ' .$cookee;
echo "</font>";
echo "<br>";
print_r(mysql_error());
echo "<br><br>";
echo '<img src="../images/flag.jpg" />';
echo "<br>";
header ('Location: index.php');
}
else
{
echo '<font color= "#0000ff" font size="3">';
//echo "Try again looser";
print_r(mysql_error());
echo "</br>";
echo "</br>";
echo '<img src="../images/slap.jpg" />';
echo "</font>";
}
}
echo "</font>";
echo '</font>';
echo '</div>';
}
else
{
if(!isset($_POST['submit']))
{
$cookee = $_COOKIE['uname'];
$format = 'D d M Y - H:i:s';
$timestamp = time() + 3600;
echo "<center>";
echo "<br><br><br><b>";
echo '<img src="../images/Less-21.jpg" />';
echo "<br><br><b>";
echo '<br><font color= "red" font size="4">';
echo "YOUR USER AGENT IS : ".$_SERVER['HTTP_USER_AGENT'];
echo "</font><br>";
echo '<font color= "cyan" font size="4">';
echo "YOUR IP ADDRESS IS : ".$_SERVER['REMOTE_ADDR'];
echo "</font><br>";
echo '<font color= "#FFFF00" font size = 4 >';
echo "DELETE YOUR COOKIE OR WAIT FOR IT TO EXPIRE <br>";
echo '<font color= "orange" font size = 5 >';
echo "YOUR COOKIE : uname = $cookee and expires: " . date($format, $timestamp);
$cookee = base64_decode($cookee);
echo "<br></font>";
$sql="SELECT * FROM users WHERE username=('$cookee') LIMIT 0,1";
$result=mysql_query($sql);
if (!$result)
{
die('Issue with your mysql: ' . mysql_error());
}
$row = mysql_fetch_array($result);
if($row)
{
echo '<font color= "pink" font size="5">';
echo 'Your Login name:'. $row['username'];
echo "<br>";
echo '<font color= "grey" font size="5">';
echo 'Your Password:' .$row['password'];
echo "</font></b>";
echo "<br>";
echo 'Your ID:' .$row['id'];
}
else
{
echo "<center>";
echo '<br><br><br>';
echo '<img src="../images/slap1.jpg" />';
echo "<br><br><b>";
//echo '<img src="../images/Less-20.jpg" />';
}
echo '<center>';
echo '<form action="" method="post">';
echo '<input type="submit" name="submit" value="Delete Your Cookie!" />';
echo '</form>';
echo '</center>';
}
else
{
echo '<center>';
echo "<br>";
echo "<br>";
echo "<br>";
echo "<br>";
echo "<br>";
echo "<br>";
echo '<font color= "#FFFF00" font size = 6 >';
echo " Your Cookie is deleted";
setcookie('uname', base64_encode($row1['username']), time()-3600);
header ('Location: index.php');
echo '</font></center></br>';
}
echo "<br>";
echo "<br>";
//header ('Location: main.php');
echo "<br>";
echo "<br>";
//echo '<img src="../images/slap.jpg" /></center>';
//logging the connection parameters to a file for analysis.
$fp=fopen('result.txt','a');
fwrite($fp,'Cookie:'.$cookee."n");
fclose($fp);
}
?>
</body>
</html>我们这里与上一关一样，修改cookie即可，唯一的附加内容就是将cookie进行base64加密：
cookie值为：
YWRtaW4xJylhbmQgZXh0cmFjdHZhbHVlKDEsY29uY2F0KDB4N2UsKHNlbGVjdCBAQGJhc2VkaXIpLDB4N2UpKSM=
这里开启了了print-r(mysql_error)所以，可以使用报错注入获取你所想要的各种信息，这里就不再多做介绍了。
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